Goal: Fill the grid using the number clues beside each row and above each column. Each number tells you how many consecutive squares are filled in that row or column. If there is more than one number, those are separate groups with at least one empty square between them, and the groups appear in the order shown. Example: 1 2 means one filled square, then at least one empty square, then two filled squares together. Tap a square to cycle Filled → X → Blank. Use X for squares you know are empty. Complete every row and column correctly to solve the puzzle.